This is my theory of conspiracy theories:

People who believe in none of them are the same as people who believe in all of them.

If you are frightened away by (or think you're too smart for) a topic because someone else tagged it as a "conspiracy theory," you have much in common with people whose "research" led them to believe the world is a frisbee and the moon is a hollow space station. 

Also, it is possible for someone who believes the Queen of England is a literal lizard to be correct about other things.  In musical terms, how many albums have you heard in which EVERY SONG is a masterpiece?  They exist, but most albums have a few flyover tunes.  Same concept.

People who believe there is no validity in any so-called "conspiracy theory" are the same as people who believe there is validity in all of them.

Anti-intellectual lunatics, in other words.